{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "4bf75046",
   "metadata": {},
   "source": [
    "# 上周回顾\n",
    "## 1.jason(文本数据）--->（Python中的字典数据）\n",
    "## 2.字典和列表的综合实践"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "c3af0a5d",
   "metadata": {},
   "source": [
    "# 本周内容\n",
    "## 集合（https://docs.python.org/3/tutorial/datastructures.html#sets）\n",
    "* 思考：了解一组数据中有哪些唯一存在的值？（假如是列表数据）\n",
    "* list_age = [18,24,35,18,23,25]\n",
    "\n",
    "> 1.集合的性质\n",
    "* 无序的\n",
    "* 不重复的\n",
    "> 2.集合的一般方法\n",
    "* 增加\n",
    "* 删除\n",
    "* 查询：in查询成员关系\n",
    "> 3.集合的数学逻辑运算"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "fc375301",
   "metadata": {},
   "source": [
    "# 集合的性质以及概念\n",
    "> 思考 ： 我想了解一组数据中有哪些唯一存在的值？（假如是列表）"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "id": "d756da43",
   "metadata": {
    "scrolled": true
   },
   "outputs": [],
   "source": [
    "# 想知道不重复的age   方法一* dict循环遍历，得到\n",
    "no_duplicata_age = []\n",
    "list_age = [18,24,25,24,18,23,18]\n",
    "for i in list_age:\n",
    "    if i not in no_duplicata_age:\n",
    "        no_duplicata_age.append(i)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "id": "27c9487b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "[18, 24, 25, 23]"
      ]
     },
     "execution_count": 29,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "no_duplicata_age"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "id": "65a0f07d",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{24, 25, 18, 23}\n"
     ]
    }
   ],
   "source": [
    "# list ----> set的方法： *方法二 set()\n",
    "no_duplicata_age_set = set(list_age)\n",
    "print(no_duplicata_age_set)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "a6478a48",
   "metadata": {},
   "source": [
    "## 官方文档测试代码"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "b1b26043",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'banana', 'orange', 'pear', 'apple'}\n",
      "True\n",
      "False\n"
     ]
    }
   ],
   "source": [
    "# 官方文档测试代码\n",
    "# 1. 移除重复项\n",
    "basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}\n",
    "print(basket)\n",
    "# 2. in 查询成员关系\n",
    "print('orange' in basket)\n",
    "print('crabgrass' in basket)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 31,
   "id": "45a018eb",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'apple', 'orange', 'banana', 'pear'}\n"
     ]
    }
   ],
   "source": [
    "# 1.移除成员关系\n",
    "basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}\n",
    "print(basket) "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "id": "06b361d5",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "False\n",
      "True\n"
     ]
    }
   ],
   "source": [
    "# 2.in查询成员关系\n",
    "print('crabgrass' in basket)\n",
    "print('orange' in basket)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "aff21c3e",
   "metadata": {},
   "source": [
    "# 集合的一般方法"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0b73458e",
   "metadata": {},
   "source": [
    "## 创建集合的两种一般方法\n",
    "* 1.set(list)\n",
    "* 2.直接按集合的结构创建：{value1，value2，value3，...}"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "37e3f63c",
   "metadata": {},
   "source": [
    "### 1.增加add()\n",
    "* 结果：Add an element to a set\n",
    "* 注意：This has no effect if the element is already present"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "295b34e9",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{0, 1, 66, 3, 4, 7, 8}\n"
     ]
    }
   ],
   "source": [
    "set_1 = {1,3,4,0,8,66,7}\n",
    "print(set_1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "id": "afe7e296",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on built-in function add:\n",
      "\n",
      "add(...) method of builtins.set instance\n",
      "    Add an element to a set.\n",
      "    \n",
      "    This has no effect if the element is already present.\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(set_1.add)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "id": "b7098ae8",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{0, 1, 66, 3, 4, 99, 7, 8}\n"
     ]
    }
   ],
   "source": [
    "set_1.add(99)\n",
    "print(set_1)\n",
    "# 则在集合里增加了99"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "id": "c6782e0a",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{0, 1, 66, 3, 4, 99, 7, 8}\n"
     ]
    }
   ],
   "source": [
    "set_1.add(66)\n",
    "print(set_1)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "f94ca020",
   "metadata": {},
   "source": [
    "### 2.删除\n",
    "> 1.pop（）\n",
    "> 2.remove（）\n",
    "> 3.discard（）"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "id": "d3ff7365",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{0, 1, 66, 3, 4, 7, 8}\n"
     ]
    }
   ],
   "source": [
    "set_1 = set([1,3,4,0,8,66,7])\n",
    "print(set_1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "ba3e7b62",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on built-in function pop:\n",
      "\n",
      "pop(...) method of builtins.set instance\n",
      "    Remove and return an arbitrary set element.\n",
      "    Raises KeyError if the set is empty.\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(set_1.pop)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "id": "46db373e",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{0, 1, 66, 3, 4, 7, 8}\n",
      "{1, 66, 3, 4, 7, 8}\n"
     ]
    }
   ],
   "source": [
    "# 1.Remove and return an arbitrary set element\n",
    "print(set_1)\n",
    "set_1.pop()\n",
    "print(set_1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "bbfd69e6",
   "metadata": {},
   "outputs": [
    {
     "ename": "KeyError",
     "evalue": "'pop from an empty set'",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mKeyError\u001b[0m                                  Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-12-0defeaec728f>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[1;31m# 2. Raises KeyError if the set is empty.\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0;32m      2\u001b[0m \u001b[0mset_2\u001b[0m \u001b[1;33m=\u001b[0m \u001b[0mset\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m[\u001b[0m\u001b[1;33m]\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 3\u001b[1;33m \u001b[0mset_2\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mpop\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mKeyError\u001b[0m: 'pop from an empty set'"
     ]
    }
   ],
   "source": [
    "# 2. Raises KeyError if the set is empty.\n",
    "set_2 = set([])\n",
    "set_2.pop()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "063522fe",
   "metadata": {},
   "outputs": [],
   "source": [
    "# 比较一下有何优势和劣势"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 40,
   "id": "653770fc",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on built-in function remove:\n",
      "\n",
      "remove(...) method of builtins.set instance\n",
      "    Remove an element from a set; it must be a member.\n",
      "    \n",
      "    If the element is not a member, raise a KeyError.\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(set_1.remove)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 56,
   "id": "f49f68b4",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{0, 1, 66, 3, 4, 7, 8}\n",
      "{0, 1, 3, 4, 7, 8}\n"
     ]
    }
   ],
   "source": [
    "# 2.Remove an element from a set; it must be a member.\n",
    "print(set_1)\n",
    "set_1.remove(66)\n",
    "print(set_1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 57,
   "id": "a555fefd",
   "metadata": {},
   "outputs": [
    {
     "ename": "KeyError",
     "evalue": "66",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mKeyError\u001b[0m                                  Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-57-85fbdeb7befa>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[0;32m      1\u001b[0m \u001b[1;31m# 2. If the element is not a member, raise a KeyError. 一般项目中 remove（）会和 in 共同使用\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[1;32m----> 2\u001b[1;33m \u001b[0mset_1\u001b[0m\u001b[1;33m.\u001b[0m\u001b[0mremove\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;36m66\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mKeyError\u001b[0m: 66"
     ]
    }
   ],
   "source": [
    "# 2. If the element is not a member, raise a KeyError. 一般项目中 remove（）会和 in 共同使用\n",
    "set_1.remove(66)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 52,
   "id": "4da92fec",
   "metadata": {},
   "outputs": [],
   "source": [
    "# 避免错误的方式\n",
    "if 66 in set_1:\n",
    "    set_1.remove(66)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 53,
   "id": "a0ae6981",
   "metadata": {
    "scrolled": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on built-in function discard:\n",
      "\n",
      "discard(...) method of builtins.set instance\n",
      "    Remove an element from a set if it is a member.\n",
      "    \n",
      "    If the element is not a member, do nothing.\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(set_1.discard)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 54,
   "id": "9ca4c4db",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{1, 3, 4, 7, 8}\n"
     ]
    }
   ],
   "source": [
    "print(set_1)\n",
    "set_1.discard(66)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 44,
   "id": "d4834447",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on built-in function remove:\n",
      "\n",
      "remove(...) method of builtins.set instance\n",
      "    Remove an element from a set; it must be a member.\n",
      "    \n",
      "    If the element is not a member, raise a KeyError.\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(set_1.remove)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 46,
   "id": "4fac0fe7",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{0, 1, 3, 4, 99, 7, 8}\n"
     ]
    }
   ],
   "source": [
    "print(set_1)\n",
    "set_1.discard(66)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "61b280ec",
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "id": "577ba77f",
   "metadata": {},
   "source": [
    "## 集合的运算\n",
    "> 1.集合的交集\n",
    ">> * 交集的使用方法\n",
    "> 2.集合的并集\n",
    "> 3.集合的差集"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "id": "3a7c5cde",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "set_1 :  {1, 2, 3, 4, 5, 6, 7}\n",
      "set_2 :  {0, 1, 66, 3, 4, 7, 8}\n"
     ]
    }
   ],
   "source": [
    "set_1 = set([1,2,5,6,7,2,3,2,4,4])\n",
    "set_2 = set([1,3,4,0,8,66,7])\n",
    "print(\"set_1 : \",set_1)\n",
    "print(\"set_2 : \",set_2)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "be930633",
   "metadata": {},
   "source": [
    "### 集合的交集\n",
    "> 1.使用集合的方法：set_1.intersection(set_2)\n",
    "\n",
    "> 2.使用逻辑运算符：set_1 & set_2"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0b8aa87d",
   "metadata": {},
   "source": [
    "set_1 : {1,2,3,4,5,6,7}\n",
    "set_2 : {0,1,66,3,4,7,8}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "id": "ad67dc29",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on built-in function intersection:\n",
      "\n",
      "intersection(...) method of builtins.set instance\n",
      "    Return the intersection of two sets as a new set.\n",
      "    \n",
      "    (i.e. all elements that are in both sets.)\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(set_1.intersection)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "id": "261ebd4a",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "set_1 :  {1, 2, 3, 4, 5, 6, 7}\n",
      "set_2 :  {0, 1, 66, 3, 4, 7, 8}\n",
      "交集结果 :  {1, 3, 4, 7}\n"
     ]
    }
   ],
   "source": [
    "# 使用集合的方法：set_1.intersection(set_2)\n",
    "print(\"set_1 : \",set_1)\n",
    "print(\"set_2 : \",set_2)\n",
    "print(\"交集结果 : \",set_1.intersection(set_2))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "id": "baeb95ce",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "set_1 :  {1, 2, 3, 4, 5, 6, 7}\n",
      "set_2 :  {0, 1, 66, 3, 4, 7, 8}\n",
      "交集结果 :  {1, 3, 4, 7}\n"
     ]
    }
   ],
   "source": [
    "# 使用逻辑运算符：set_1 & set_2\n",
    "print(\"set_1 : \",set_1)\n",
    "print(\"set_2 : \",set_2)\n",
    "print(\"交集结果 : \",set_1 & set_2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "id": "8c1bb739",
   "metadata": {},
   "outputs": [],
   "source": [
    "# 实践：\n",
    "set_1_xu = {\"星期一12-14\",\"星期二3-5\",\"星期二12-14\" }\n",
    "set_2_前端 = {\"星期二3-5\",\"星期二12-14\"}"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "id": "ecb98801",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'星期二3-5', '星期二12-14'}\n",
      "结论：周一班 API课 让给前端的同学~\n"
     ]
    }
   ],
   "source": [
    "print(set_1_xu & set_2_前端)\n",
    "print(\"结论：周一班 API课 让给前端的同学~\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "b56c732d",
   "metadata": {},
   "source": [
    "## 集合的并集\n",
    "> 1.使用并集的方法：set_1.union(set_2)\n",
    "\n",
    "> 2.使用逻辑运算符：set_1 | set_2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "id": "44e0f97f",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "set_1 :  {1, 2, 3, 4, 5, 6, 7}\n",
      "set_2 :  {0, 1, 66, 3, 4, 7, 8}\n",
      "交集结果 :  {0, 1, 2, 3, 4, 5, 6, 7, 66, 8}\n"
     ]
    }
   ],
   "source": [
    "# 1.使用并集的方法：set_1.union(set_2)\n",
    "print(\"set_1 : \",set_1)\n",
    "print(\"set_2 : \",set_2)\n",
    "print(\"交集结果 : \",set_1.union(set_2))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "id": "01eb1db9",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "set_1 :  {1, 2, 3, 4, 5, 6, 7}\n",
      "set_2 :  {0, 1, 66, 3, 4, 7, 8}\n",
      "交集结果 :  {0, 1, 2, 3, 4, 5, 6, 7, 66, 8}\n"
     ]
    }
   ],
   "source": [
    "# 2. 使用逻辑运算符：set_1 | set_2\n",
    "print(\"set_1 : \",set_1)\n",
    "print(\"set_2 : \",set_2)\n",
    "print(\"交集结果 : \",set_1 | set_2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "id": "794b2841",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "开始的时间 :  1640136015.3019788\n",
      "set_1 :  {1, 2, 3, 4, 5, 6, 7}\n",
      "set_2 :  {0, 1, 66, 3, 4, 7, 8}\n",
      "交集结果 :  {0, 1, 2, 3, 4, 5, 6, 7, 66, 8}\n",
      "结束的时间 :  1640136015.3029795\n",
      "运行的时间 :  0.0010006427764892578\n"
     ]
    }
   ],
   "source": [
    "# 计算运行效率 = 运行后的时间节点 - 运行前的时间节点  : 思考并对比列表运算的执行效率 \n",
    "import time\n",
    "start_time = time.time()\n",
    "print(\"开始的时间 : \",start_time)\n",
    "print(\"set_1 : \",set_1)\n",
    "print(\"set_2 : \",set_2)\n",
    "print(\"交集结果 : \",set_1 | set_2)\n",
    "stop_time = time.time()\n",
    "print(\"结束的时间 : \",stop_time)\n",
    "print(\"运行的时间 : \", stop_time - start_time)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "997debe8",
   "metadata": {},
   "source": [
    "## 集合的差集（考虑先后顺序）\n",
    "> 使用差集的方法：set_1.difference(set_2)\n",
    "\n",
    "> 使用逻辑运算符：set_1 - set_2"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 22,
   "id": "0d6fa293",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "set_1 :  {1, 2, 3, 4, 5, 6, 7}\n",
      "set_2 :  {0, 1, 66, 3, 4, 7, 8}\n",
      "set_1 和 set_2 差集结果 :  {2, 5, 6}\n"
     ]
    }
   ],
   "source": [
    "print(\"set_1 : \",set_1)\n",
    "print(\"set_2 : \",set_2)\n",
    "print(\"set_1 和 set_2 差集结果 : \",set_1.difference(set_2))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 23,
   "id": "d6e3cd27",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "set_1 :  {1, 2, 3, 4, 5, 6, 7}\n",
      "set_2 :  {0, 1, 66, 3, 4, 7, 8}\n",
      "set_2 和 set_1 差集结果 :  {0, 8, 66}\n"
     ]
    }
   ],
   "source": [
    "print(\"set_1 : \",set_1)\n",
    "print(\"set_2 : \",set_2)\n",
    "print(\"set_2 和 set_1 差集结果 : \",set_2.difference(set_1))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 24,
   "id": "bd326ced",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "set_1 :  {1, 2, 3, 4, 5, 6, 7}\n",
      "set_2 :  {0, 1, 66, 3, 4, 7, 8}\n",
      "set_1 和 set_2 差集结果 :  {2, 5, 6}\n"
     ]
    }
   ],
   "source": [
    "print(\"set_1 : \",set_1)\n",
    "print(\"set_2 : \",set_2)\n",
    "print(\"set_1 和 set_2 差集结果 : \",set_1 - set_2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "id": "63389b9d",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "set_1 :  {1, 2, 3, 4, 5, 6, 7}\n",
      "set_2 :  {0, 1, 66, 3, 4, 7, 8}\n",
      "set_2 和 set_1 差集结果 :  {0, 8, 66}\n"
     ]
    }
   ],
   "source": [
    "print(\"set_1 : \",set_1)\n",
    "print(\"set_2 : \",set_2)\n",
    "print(\"set_2 和 set_1 差集结果 : \",set_2 - set_1)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "feb6bacf",
   "metadata": {},
   "source": [
    "## 对称差集\n",
    "> 用对称差集的方法：set_1.symmetric_difference(set_2)\n",
    "\n",
    "> 使用逻辑运算符：? (set_1 - set_2) | (set_2-set_1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "id": "dcfd4d85",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on built-in function symmetric_difference:\n",
      "\n",
      "symmetric_difference(...) method of builtins.set instance\n",
      "    Return the symmetric difference of two sets as a new set.\n",
      "    \n",
      "    (i.e. all elements that are in exactly one of the sets.)\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(set_1.symmetric_difference)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "id": "2582b773",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "set_1 :  {1, 2, 3, 4, 5, 6, 7}\n",
      "set_2 :  {0, 1, 66, 3, 4, 7, 8}\n",
      "对称差集结果 :  {0, 66, 2, 5, 6, 8}\n"
     ]
    }
   ],
   "source": [
    "print(\"set_1 : \",set_1)\n",
    "print(\"set_2 : \",set_2)\n",
    "print(\"对称差集结果 : \",set_1.symmetric_difference(set_2))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 28,
   "id": "acdc2c57",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "set_1 :  {1, 2, 3, 4, 5, 6, 7}\n",
      "set_2 :  {0, 1, 66, 3, 4, 7, 8}\n",
      "对称差集结果 :  {0, 2, 66, 5, 6, 8}\n"
     ]
    }
   ],
   "source": [
    "print(\"set_1 : \",set_1)\n",
    "print(\"set_2 : \",set_2)\n",
    "print(\"对称差集结果 : \",(set_1 - set_2) | (set_2-set_1))"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0c08377d",
   "metadata": {},
   "source": [
    "# 集合实践：(P129)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 29,
   "id": "a470f030",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Provide a word to search for vowels:aeiou\n",
      "u\n",
      "e\n",
      "o\n",
      "i\n",
      "a\n"
     ]
    }
   ],
   "source": [
    "vowels = set('aeiou')\n",
    "word = input(\"Provide a word to search for vowels:\")\n",
    "found = vowels.intersection(set(word))\n",
    "for vowel in found:          \n",
    "    print(vowel)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "id": "bfa64736",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "vowels :  {'u', 'e', 'o', 'i', 'a'}\n",
      "Provide a word to search for vowels:hello zhichao\n",
      "word :  {'e', ' ', 'o', 'z', 'i', 'a', 'c', 'l', 'h'}\n",
      "{'o', 'e', 'i', 'a'}\n"
     ]
    }
   ],
   "source": [
    "vowels = set('aeiou')\n",
    "print(\"vowels : \",vowels)\n",
    "word = input(\"Provide a word to search for vowels:\")\n",
    "print(\"word : \",set(word))\n",
    "found = vowels.intersection(set(word))\n",
    "print(found)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "3b74cb1c",
   "metadata": {},
   "source": [
    "# 课后作业\n",
    "> 课堂练习\n",
    "课本第三章 课后项目练习\n",
    "总结集合方法"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "58c8569e",
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.8.8"
  },
  "toc": {
   "base_numbering": 1,
   "nav_menu": {},
   "number_sections": true,
   "sideBar": true,
   "skip_h1_title": false,
   "title_cell": "Table of Contents",
   "title_sidebar": "Contents",
   "toc_cell": false,
   "toc_position": {},
   "toc_section_display": true,
   "toc_window_display": false
  }
 },
 "nbformat": 4,
 "nbformat_minor": 5
}
